Small Block Ford Aluminum Flywheel, 164 teeth ring gear Came off my friends oval track dirt car. He went to a Brinn set-up. 10" clutch. Used, but not used up. Couple of pits in clutch contact surface. Has the heavy metal for externally balanced engines. 164 teeth on ring gear and is nice. It has "Dutchman's" (pins) to prevent ring from slipping on aluminum. $100 + shipping